JPS6010841B2 - Method for reshaping axle wheels for railway vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention comprises a tool carrier with at least two cutting tools in the direction of feed in the direction of the wheel axis, one of the cutting tools being The present invention relates to a method for reshaping a wheel axle for a railway wheel in the manner of pre-machining a working band.

With this method, we can produce wheels with relatively little wear.
By means of a special tool with cutting elements specially formed for the shaping of this wheel, before reproducing the final shape with another tool with suitable cutting elements independent of this tool, the above It is known that a special tool can be used to cut more than the above amount of wear (Sellers-Soli port building Mac).
(See hineTool Corporation Corporate Report No. 3101). 0 Pre-processing in a separate work step is necessary.

Because the degree of wear shows a different distribution across the width of the wheel, the depth of cut required to form the final shape in the band with the least wear is too small for commercially available and therefore expensive cutting elements. Because it's too big.
Reshaping according to the known methods using commercially available cutting elements therefore necessarily involves time-consuming working steps involving various tool carriers. Furthermore, a wheel shaft cutting machine is known from German Patent No. 1 258 237.

In this wheel shaft cutting machine, two profiling carriages are mounted on a common longitudinal carriage, each of these profiling carriages carries one tool, and these profiling carriages The carriages scan a common profile model with the feelers respectively belonging to these carriages. In this case, each tool recuts the other profile to finish both cuts. In this case, each tool reshapes the area to be machined one by one. Furthermore, this forming is performed so that completed shapes can be obtained in sequence in the two regions to be processed. In this case, multiple cuts have to be made when the cutting depth is relatively large, and in this case the feed rate of the treading tool is exactly the same as the relatively slow axial feed rate of the flanging tool. The disadvantage is that it can only reach a moderate speed. Therefore, the tread surface can only be machined at an extremely low vertical feed rate. The problem of the present invention is that the cutting depth invariably exceeds the cutting range of such cutting tools, and this results in the need for redundant cutting operations, where the shape has to be cut in several repeated cutting operations. The object of the present invention is to create a method for reshaping a wheel axle for a railway wheel, which can be reshaped without any commercially available cutting elements.

The above problems are solved by the present invention as follows.

That is, the reshaping is carried out with at least three cutting tools arranged one after the other, which are fed together from the wheel tread in the direction of the flange, in which case two of these cutting tools cut the workpiece band of the wheel. , the first cutting tool cuts the flange,
The second cutting tool performs cutting by pre-machining the tread surface, the third cutting tool performs finishing cutting of the entire shape, and the second cutting tool is moved from the working position in a half-fold direction before reaching the flange. Solved by pulling back with feed.

With the method according to the invention, it is possible to refinish a worn profile in only one cutting cycle. Taking into account the total cutting depth required for reshaping, it is no longer necessary to distribute the reshaping work by a number of successive cutting periods.

Finishing of the shape is carried out again in only one working week, and commercially available cutting tools can be used for this. Therefore, cost-effective tools can be used, and at the same time the machining time for reshaping is extremely short. This advantage can be achieved without increasing the power of the machine, as is customary in the art. The set machine power is fully utilized when applying the method according to the invention, and at the same time unproductive return strokes and positioning times are saved. When using the method according to the invention, whenever a tool cuts a small area to the wear depth, at the same time the other tools are under full cutting operation. This results in uniform loading of the drive motor efficiency. A further development of the method according to the invention provides that, on the one hand, carrying out the above-mentioned pre-machining may result in a workpiece whose cutting depth for reshaping is too large to be cut in the working range of a single cutting tool within this area. The belt is precisely defined, while the time required for preliminary cutting is reduced to a minimum.

In addition to the above, in the present invention, the flange preliminary machining and the tread preliminary machining can be performed at the same time using separate cutting tools that are fed together in the flange direction from the wheel tread for these machining. I suggest doing it at least the same width. In order to uniformly and fully utilize the power output used, and in connection with this to ultimately increase the efficiency of profile, another feature of the invention provides that the preliminary machining of the tread is completed at the same time as the start of the finishing cut. We propose that the cutting tool be moved to a working position where cutting operations are not performed. The invention will be explained in more detail below with reference to embodiments illustrated in the accompanying drawings.

With the exception of structures corresponding to the device according to the invention, such cutting machines are described, for example, in UK Patent No. 1,017,493 or in US Pat. It is shown.

However, the above-mentioned patent specification is cited only as an example of such a processing machine, and there are many suitable processing machines that can be modified to carry out the method according to the invention. Although not shown in detail, the strapping member 6, which is suitable for reshaping a wheel set and which is mounted, for example, on the chuck of a cutting machine of the type mentioned at the outset, can be used for the wheel 1, shown in FIG.
2 and transmits the rotational moment necessary for reshaping.

FIG. 1 shows the remolding state of the logical shaft immediately after the start of processing.
In this case, the tool Z-3 pre-cuts the flange and the tool 4-
Tool 1, which moves independently of tool 3, pre-cuts the tread surface (FIG. 1). A tool 5, which is provided immediately behind, performs the final cutting of the shape. From this cutting work process, when the tool 4 is in the Z state where preliminary machining has not been performed,
It is clear that the working area for tool 5 does not yet exist at the start of machining. Due to the inclined cutting edge of the tool 4, the risk of damage to this tool at the start of cutting is significantly reduced. FIG. 2 shows the working phase in which the remolding condition is already in progress.

In this cutting phase, preliminary machining of the flange by the tool 3 has just been completed, and the independently movable tool 4 has already been moved outside the cutting work range. However, the tool 5 now performs a finishing cut with full mechanical power. There is no longer a depth of cut at any position of the shape that exceeds its working range.

[Brief explanation of drawings]

In FIGS. 1 and 2, two different wear profiles of both wheels of a wheel set are shown superimposed. In this case, the already cut parts are shown in solid color, and the dashed line shows the correct unworn shape of the axle wheel. The shaded area defined by the lower solid line and the upper solid line indicates the contour of the axle wheel to be cut. The outline of the part to be cut is drawn with a solid line without taking into account the overlapping caused by the illustrated tool. The symbols in the figure are 1, 2...Wheel, 3...Tool, 4...Movable tool, 5...Tool, 6......・Banding member, 7...
...Axis of argument. Figure 1 Figure 2

Claims (1)

[Claims] 1. A tool carrier with at least two cutting tools in the feeding direction along the axis of the wheel, one of these cutting tools pre-machining the workpiece zone of the wheel. In a method for reshaping a wheel of a wheel axle for a railway vehicle of the type, the reshaping is carried out with at least three cutting tools provided one after the other, fed together in the direction of the flange from the wheel tread, in which case these Two of the cutting tools are used to pre-process the area to be machined of the wheel, the first cutting tool is used to cut the flange, the second cutting tool is used to pre-process the tread surface, and the third cutting tool is used to cut the entire area. Finish cutting the shape,
A method as described above, characterized in that the second cutting tool is withdrawn with a radial feed from the working position before reaching the flange. 2. characterized in that the pre-machining of the flange and the pre-machining of the tread are carried out practically simultaneously and with at least the same width as the pre-machining of the flange, with separate cutting tools that are fed together in the direction of the flange from the wheel tread for these machinings. , a method according to claim 1. 3. The method according to claim 1 or 2, characterized in that, at the start of finishing cutting, the cutting tool that has finished preliminary machining of the tread surface is moved to a position where no cutting work is performed.